Characterization of Advanced Cold-Recycled Bitumen Stabilized Pavement Solutions

Transcription

1 CEDR Transnational Road Research Programme Call 2012 Characterization of Advanced Cold-Recycled Bitumen Dr Ciaran McNally UCD School of Civil, Structural & Environmental Engineering

2 CALL 2012 Recycling Noise Safety Climate Road construction in a post-fossil fuel society Characterization of advanced cold recycling bitumen stabilized pavement solutions CoRePaSol

3 Project information Project coordinator: Czech Technical University Starting date: 01/01/2013 Planned End date: 31/12/2014 Project costs: ~ 373,000 5 partners

4 Project partners University College Dublin Wirtgen GmBH Czech Technical University Laboratório Nacional de Engenharia Civil University of Kassel

5 Background strategic outlook Assessment of European cold recycling pavement techniques and national designs Harmonized mix design procedures Suitable performance based tests for cold recycling Effective inclusion of cold-recycled mixture in existing pavement design manuals Multiple recycling and activity of RAP Utilization of alternative binders Environmental aspects

6 Project objectives Harmonized European cold recycled design procedures Performance based mix design for more effective use Estimate material parameters Recyclability of cold-recycled material (RA activity) Environmental stability (leaching, tar detection, etc. ) Carbon footprint /life cycle analysis

7 Work program WP Work package title 1 Advanced mix design for cold-recycled materials 2 Durability of cold-recycled bitumen stabilized material 3 Pavement design with cold-recycled bitumen stabilized base 4 5 Recyclability of cold-recycled BSM applications Environmental compatibility of cold-recycled BSM applications 6 Dissemination and management

8 Cold recycling material and its stabilizing agents Foamed bitumen Hydraulic binder Bituminous emulsion Bitumen stabilised cold recycling mixtures

9 Definition of cold recycled material binder effect

10 Binder contents of cold recycling mixtures with bituminous emulsion in Europe Different definitions Czech Republic Germany Ireland /United Kingdom Norway Portugal/Spain Wirtgen Manual (residual) reference : Grilli et al. (2012)

11 Binder contents of cold recycling mixtures with foamed bitumen in Europe Different definitions Czech Republic Germany Ireland /United Kingdom Norway Portugal/Spain Wirtgen Manual (residual) reference: Grilliet al. (2012)

12 Comparison compaction methods used in Europe Lowest void content with static compaction! Static compaction Marshall compaction Load Proctor compaction voids [%] Loading plate Cylindrical specimen 5 0 czech republic German mix design standard vibrating table marshall (50 beats each side) marshall (100 beats each side) proctor compaction methods Duriez test Gyratory compaction

13 Influence of curing...in climate chamber under well-defined conditions Cold recycling mixtures (foamed bitumen/emulsion) 1,200 Simulate different humidity... ITS14days [N/mm²] 1,000 0,800 0,600 0,400 0,200 0,000 foam emulsion foam emulsion foam emulsion foam emulsion...under room conditions 40% humidity, 20 C 55% humidity, 20 C 70% humidity, 20 C room conditions curing conditions

14 Activity of reclaimed asphalt bitumen Cold recycling mixtures (w/ foam bitumen and/or bituminous emulsion) Mix variables: Reclaimed asphalt Reclaimed concrete Reclaimed unbound material Different milling depths Pavement inconsistencies ITS, water susceptibility, CBR wearing course cement concrete unbounded material

15 Activity of reclaimed asphalt bitumen ITS Results (bituminous emulsion) indirect tensile strength ITS 28days [N/mm²] 1,600 1,400 1,200 1,000 0,800 0,600 0,400 0,200 0,000 I II III IV Va Vb VI VII mix variations (bituminous emulsion) RA / RCC / RUM I 100/0/0 II 0/50/50 III 0/0/100 IV 50/25/25 Va 50/0/50 Vb 75/0/25 VI 0/25/75 VII 40/20/40 Different content of reclaimed asphalt reclaimed cement concrete reclaimed unbound material Same content of water binder Same grading

16 Activity of reclaimed asphalt bitumen CBR Results (bituminous emulsion) CBR-value [%] I II III IV Va Vb VI VII mix variations (bituminous emulsion) RA / RCC / RUM I 100/0/0 II 0/50/50 III 0/0/100 IV 50/25/25 Va 50/0/50 Vb 75/0/25 VI 0/25/75 VII 40/20/40 Different content of reclaimed asphalt reclaimed cement concrete reclaimed unbound material Same content of water binder Same grading

17 Selected job sites: Germany Core drilling for leaching tests with tar contained layer immobilized by cold recycling and known mechanical properties long term experience (25 years old) Cold recycling layer with tar Main field S d 4 cm 10 cm 15 cm 10 cm 39 cm Hamburg Lingen Germany

18 Selected job sites: Finland Sampling for studying material properties Material samples of asphalt top layer, gravel, asphalt top layer, unbound material Kauhajoki Finland Helsinki Preparing Marshall specimens The result

19 Selected job sites: Finland Bitumen tank in front of the WR recycler Water for the right water content Compaction Compaction check by Troxler sensor head Milling and mixing gravel, asphalt top layer and unbound material

20 Selected job sites: Czech Republic rehabilitation of R7 expressway base layer cold recycling depth of 18 cm length: 1,5 km R7 expressway, Knoviz Prague Cement application Cold in-situ recycling by DCR machine

21 Selected job sites: Czech Republic use of foamed bitumen (2,8 %) and cement (4 %) overlay by 2 asphalt layers Texture of recycled layer Sufficient compaction Water spraying on fresh CR

22 Selected job sites: Ireland N77: Hennebry s Cross, Kilkenny Legacy road, variable pavement structure 2 km trial section Bitumen emulsion and foamed bitumen used

23 17/07 Characterization of Advanced Cold-Recycled Bitumen Step 1: Recycling 300mm depth (Emulsion or Foam Mix) Step 2: Sealing at the end of each day (binder course) Step 3: HRA Overlay 7 days after recycling

24 Selected job sites: Ireland 5 trial sections: 4 emulsion & 1 foamed bitumen Residual binder content: % Cement content: 0 1.5% 12,000 tonnes of material recycled 4,000 tonnes of bituminous 8,000 tonnes of granular Data being used for: Conditioning assessment Environmental assessment (leaching & LCA)

25 Project Team Coordinator: Dr Jan Valentin (CTU) Project Team: Dr Fátima Batista (LNEC), Dr Michael Engels (Wirtgen), Mr Eanna Fallon (UCD), Dr Ana Cristina Freire (LNEC), Dr Ciaran McNally (UCD), Dr Konrad Mollenhauer (UoK), Ms Aoife Quinn (UCD), Ms Diane Simnofske (UoK), Mr Vaclav Snižek, Dr Amir Tabaković (UCD)

26 Thank you for your attention